Saw blade



March 30 1926. 1,579,039

w. c. STEFFAN ET AL SAW BLADE Filed Dec. 29. 1924 I I I Fin 12A j flcie/wzamlb A/ 5 la an Nil/5Z6) I Grew/5a]; MENTOR wnusss: ATTORNEY To all whom it may concern:

Patented Mar. so, 1926. I

WILLIAM c. STEFFAN, FRANK IBLVVACKLERMIANN, nnnwnilrnn JLeR I'NERQ or onrcaeo', ILIJrNo'Is.

sAw BLA 7 Application filed December 29, 1924. Serial No. 73,736.

Be it known that we, WILLIAM C. STEF- FAN, FRANK B. AoKERMANN, and WALTER J. GREINER, all citizens of the United States, residing at 4532 Palmer Street,.Chicago, in

the county of Cook and State of Illinois,

have invented new and useful Improve ments in Saw Blades, of which the following is a specification.

This .invention relates to a novel con- 7 struction of sawblade and has for its primary object the shaping ofthe ends of the blade so that the same may bemore rigidly "limited to the. exact shape and construction andaccurately secured to a saw frame.

An object of the invention is the shaping of the ends of the blade to provide a connection between the blade and frame in such a manner that the ends of the blades will be reinforced. I

Besides the above our invention is distinguished in shaping the ends of the blade into a plurality of flanges having a snug fit with the slots of the frame and so cooperata slot 5 intersecting the recess.

. ing with the walls of the slot that excessive strain will not mutilate the connection.

. With these and other objects in view the invention will be better understood from the following descriptiontaken in connech v back upon itself to form parallel-limbs for tion with the. accompanying drawings, wherein:

Fig. 1 1s a fragmentary view of the frame showing one i end of the blade attached a i 1 flange in the use of the'blade thereto.

Fig. 2 is a P rspective view of one nd of the blade. V

Fig. 3 is a perspective view of another construction of blade.

Fig. 4 is a side elevation of that con-' struction shown in Fig. 3. I

Again referring to thedrawing illustrating one of the many constructions ofmy invention the numeral 1 designates an ordinary well-known commercial type or sawframe including the handle 2 and the clamp 3 having the undercut recess 4 and Our improved blade 6 comprises the body portion 7 with each end portion looped or bentto form parallel limbs 8 that provide the flange 9. A tongue 10 is formed at the continuation of the flange. and is arranged in alignment with the body 7. The flange 9 is arranged at an incline to snugly fit in the undercut recess 4. A portion of the body is arranged in the slot 5 while the j i said flange.

' tongue 10 also engages inthe slot 5. Thus the connection is such that a rigid effective gr p is accomplished and any strain to which the flange Sis subject is reinforced by the novel arrangement of the tongue 10 in the slot.

In Figures 3 and 4 we have shown the end portion of the saw bent to, provide two sets of parallel limbs 11 to provide two flanges 12 that are-arranged in the recess .4.

There are various ways of shaping and arranging the flanges to provide the con? nection and therefore we do not desire to be illustrated as the main feature of our invention is to associate the ends of the blades "as to reinforce, the-same and besides pro- 2. A saw blade having end portion bent providing a flange, and a tongue extending at an angle to the flange and in alignment with the body of the blade to reinforce said 3. In combination with" a saw frame ineluding a clamping member having an undercut recess and a slot intersecting the same, a blade having its end portionformed to provide. a laterally projecting flange, said flange being disposedin. parallelism with the contacting undercut Wall of the recess.

4. In combination with a saw frameinj eluding a"clamp1ng.;member having an undercut recess and a slot intersecting the}:

same, a blade having its. end portion formed to provide a laterally projecting flange and a tongue extending therefrom, said flange being disposed in parallelismwith the contacting'undercut wall of the recess and the tongue fitting into the ,slot beyond the flange to reinforce the latter,

5. As a newarticle of manufacture, a saw blade having its end portion formed to provide a laterally projecting flange disposed at an inclination inwardly of the saw blade having its end portion formed to? provide a laterally projecting flange disposed at'an inclination inwardly of the blade from' the front to the back thereof, the blade being extended beyond the flange and forming a tongue for reinforcing gthe flange when the blade is secured in a saw frame. 10 In testnnony whereof, We aflix our Slgnatures.

WILLIAM o. STEFFA'N. FRANK B. ACKERMANN. WALTER J. GREINER. 

